For all you spy wannabes the UK's very own GCHQ (Government Communications Headquarters) in charge of electronic and cyber intelligence is sending out their yearly greeting card that doubles as several difficult puzzles about solving cyphers and finding clues. This year's challenge features seven puzzles plus several hidden elements for those who want an extra test. If you would like to give it a try the card can be downloaded at the GCHQ website. Happy puzzling!
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